Hi Winter Wish,
I'm going through the same process at the moment so we might be able to help each other! I was diagnosed with chronic pancreatitis (aged 12) just 2 years before my UC appeared. i had my pouch operation aged 17 and I'm now 27 and up until now so far so good! No problems with my pancreas since that initial 1st attack, so my GI who i see now thinks it was a missed diagnosis and maybe it was auto immune pancreatitis. She's running tests on me at the moment and my faecal elastase has come back abnormally low, which suggests pancreatic insufficiency. She's repeated the test and I'm awaiting results, but from a bit of research there appears to be a link between IBD and pancreatic insufficiency. There also appears to be a slight flaw in the test that would appear to give false-positive results, in that there is a correlation between the more BM's, watery stools and history of surgery you have, the more likely the elastase will be diluted for the results. Being J-pouchers, those 3 factors must hold more weight for us surely!
You can read the study here:
IBD and PI Its a medical paper but you can pick the important bits out!
I will let you know how i progress with my GI, how are things panning out your end?